Countertop liquid cooler



FIG. 1 is a perspective view of a countertop liquid cooler showing my new design;

FIG. 2 is a front view of the design shown in FIG. 1;

FIG. 3 is a left-side view of the design shown in FIG. 1;

FIG. 4 is a rear view of the design shown in FIG. 1;

FIG. 5 is a right-side view of the design shown in FIG. 1;

FIG. 6 is a top view of the design shown in FIG. 1; and,

FIG. 7 is a bottom view of the design shown in FIG. 1. 

CLAIM The ornamental design for a countertop liquid cooler, as shown and described. 